I need to multiply two matrices one we call P type 1x4 another called Q type 4x1
I cannot find values that will give me an identity matrix as a result when I multiply PQ together.
Where zeros are not allowed.
2026-03-26 13:50:44.1774533044
Two matrices whose product is equal to the identity matrix
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Take $P=(1\;1\;1\;1)$ and $Q=\frac14^{\mathrm t\!}P$.